import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

// 处理body格式为 application/x-www-form-urlencoded 的post请求
@WebServlet("/postParameterServlet")
public class postParameterServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 预期传来的 Post 请求的参数是 userId=10&classId=20
        String userId = req.getParameter("userId");
        String classId = req.getParameter("classId");
        resp.getWriter().write("userId = " + userId
                + ", classId = " + classId);
    }
}
